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  • TI Thinks Resolved

DS90UB940-Q1:ds90ub940-q1

Part Number: DS90UB940-Q1

We are currently debugging the ds90ub940-q1 chip, which can be unrecognized. What is the reason

  • you mean the I2C?

    best regards,
    Steven
  • In reply to Junqiang Shi:

    Hi Steven,
    I hope you can help me,
    I can't detect I2C address both DS90UB940 and DS90UB947.
    I have resistor pull-up 4.7K ohm to VDDI2C 3.3V for both IC.
    DS90UB947: I2CSEL leave floating for 3.3V I2C, INTB pull-up 4.7K ohm to VDDIO 1.8V
    I tried set appropriate voltage on the IDx input , but still cant detect I2C address
    I really need your help.
    Brs,
    Bang
  • In reply to Bang Duong:

    1. can you use TI's ALP tool to check your on-board UB947?
    2. please check the IDX resistor's value and accuracy, and 7bits or 8bits address? also please check your I2C timing.

    best regards,
    Steven
  • In reply to Junqiang Shi:

    thank you very much!

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